Hans: When I instrumented the board it seemed like the temp on the board stabilized after about a half hour to 45 minutes in the oven. I added a bit of time to accomodate traffic in and out of the oven. Bill K. > -----Original Message----- > From: Hinners Hans Civ WRALC/LYPME [SMTP:[log in to unmask]] > Sent: Wednesday, August 16, 2000 12:41 PM > To: [log in to unmask] > Subject: Re: [TN] Wave soldering ancient designs... > > Hi Bill, > > How'd you arrive at an hour for preheat time? > (Why question it, Hans, it works, run with it.) > > Since we only have bottom side preheat our assemblies get baked in an oven > too - pallet and all. > > Hans > > ~~~~~~~~~~~~~~~~~~~ > Hans M. Hinners > Materials Engineer (Process & Manufacturing) > Warner Robins Air Logistics Center > Avionics Production Division > Manufacturing Branch > 380 Second Street, Suite 104 > Building: 640, Mail Stop: LYPME > Robins AFB, GA 31098-1638 > Voice: (478) 926 - 1970 Fax: (478) 926 - 7164 > mailto:[log in to unmask] > http://www.robins.af.mil > > > -----Original Message----- > From: Kasprzak, Bill (esd) USX [mailto:[log in to unmask]] > Sent: Wednesday, August 16, 2000 11:57 AM > To: [log in to unmask] > Subject: Re: [TN] Wave soldering ancient designs... > > > Steve: > > I kept my nose outta your problem with respect to not getting solder joint > topside fillets on selected connections because I wanted to see if your > problem could be solved by folks who use RMA fluxes. Seeing that you're > still in deep doodo, I'll offer the following: > > I have several different "backpanel" that are .095 thick PWB's with heavy > heatsink holes in certain areas on the board. I am able to wavesolder > these > boards quite easily by using a flux that is water-based instead of alcohol > based. > > What I do is pre-heat my loaded assembly in an oven at about 190 - 200 > deg. > F for about an hour. From the oven the "hot" assembly is transported > directly to my conveyor on my wave machine. I manually spray the bottom of > the board with my water based flux (Kester HF-1189A) and send the board on > its merry way through my regular soldering process on my ancient Treiber > Wavesolder machine. Results are usually pretty good. Seems that the water > based flux takes longer to dry out as opposed to the alcohol based flux > and > is still quite active at the wave. > > The only other process I can suggest is a vapor phase process which is > not > too common anymore. > > You can contact me off line via e-mail or give me a call. I can fill you > in > on details. > > Yes, this board is for a High-Rel Mil program. > > Just my two-cents worth. > > Bill Kasprzak > Moog Inc. > 716-652-2000 ext 2507 > > -----Original Message----- > > From: Stephen R. Gregory [SMTP:[log in to unmask]] > > Sent: Tuesday, August 15, 2000 9:58 PM > > To: [log in to unmask] > > Subject: [TN] Wave soldering ancient designs... > > > > Hey all... > > > > The last couple of weeks have been interesting to say the least as far > as > > my > > wave soldering goes...(Hey Joyce! Any openings at your new > > place?...gofer', > > janitor, anything?... ;^)...). > > > > You may have read about my problems with the way pins connect to inner > > planes > > and all that, but now the last few days I've been trying to wave > > assemblies > > that have metal heat-sinks bonded to the top of the PCB with the PTH > > components installed on top of the heat-sink and then into the PCB... > > > > Again, I've tried everything that my feeble mind (at this point) can > > possibly > > do to wave these bloody things... > > > > I'm thinking that designs such as these cannot be wave soldered with any > > good > > results. Am I wrong in thinking that? Do these designs have to be hand > > built? > > Am I just spinning my wheels trying to wave solder them? > > > > Gawd, I'm getting beat-up by so many people because I can't figure out > how > > to > > wave these pieces of...of...of..."work"... > > > > -Steve Gregory- > > > > ############################################################## > > TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c > > ############################################################## > > To subscribe/unsubscribe, send a message to [log in to unmask] with > > following text in > > the body: > > To subscribe: SUBSCRIBE TECHNET <your full name> > > To unsubscribe: SIGNOFF TECHNET > > ############################################################## > > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for > > additional > > information. > > If you need assistance - contact Keach Sasamori at [log in to unmask] or > > 847-509-9700 ext.5315 > > ############################################################## > > ############################################################## > TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c > ############################################################## > To subscribe/unsubscribe, send a message to [log in to unmask] with > following > text in > the body: > To subscribe: SUBSCRIBE TECHNET <your full name> > To unsubscribe: SIGNOFF TECHNET > ############################################################## > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for > additional > information. > If you need assistance - contact Keach Sasamori at [log in to unmask] or > 847-509-9700 ext.5315 > ############################################################## > > ############################################################## > TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c > ############################################################## > To subscribe/unsubscribe, send a message to [log in to unmask] with > following text in > the body: > To subscribe: SUBSCRIBE TECHNET <your full name> > To unsubscribe: SIGNOFF TECHNET > ############################################################## > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for > additional > information. > If you need assistance - contact Keach Sasamori at [log in to unmask] or > 847-509-9700 ext.5315 > ############################################################## ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. 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